3 files changed, 24 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_context.h b/src/mesa/tnl/t_context.h
index c19eb3df3cb..6137c2d2fe5 100644
--- a/src/mesa/tnl/t_context.h
+++ b/src/mesa/tnl/t_context.h
@@ -548,4 +548,8 @@ typedef struct
 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 
 
+extern void
+tnl_clip_prepare(GLcontext *ctx);
+
+
 #endif
diff --git a/src/mesa/tnl/t_vb_program.c b/src/mesa/tnl/t_vb_program.c
index 5d89f8bc313..c10a27614ff 100644
--- a/src/mesa/tnl/t_vb_program.c
+++ b/src/mesa/tnl/t_vb_program.c
@@ -131,6 +131,8 @@ do_ndc_cliptest(GLcontext *ctx, struct vp_stage_data *store)
    store->ormask = 0;
    store->andmask = CLIP_FRUSTUM_BITS;
 
+   tnl_clip_prepare(ctx);
+
    if (tnl->NeedNdcCoords) {
       VB->NdcPtr =
          _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
diff --git a/src/mesa/tnl/t_vb_vertex.c b/src/mesa/tnl/t_vb_vertex.c
index 6a746417c87..4734754ea40 100644
--- a/src/mesa/tnl/t_vb_vertex.c
+++ b/src/mesa/tnl/t_vb_vertex.c
@@ -118,6 +118,22 @@ static void (*(usercliptab[5]))( GLcontext *,
 };
 
 
+void
+tnl_clip_prepare(GLcontext *ctx)
+{
+   /* Neither the x86 nor sparc asm cliptest functions have been updated
+    * for ARB_depth_clamp, so force the C paths.
+    */
+   if (ctx->Transform.DepthClamp) {
+      static GLboolean c_funcs_installed = GL_FALSE;
+      if (!c_funcs_installed) {
+         init_c_cliptest();
+         c_funcs_installed = GL_TRUE;
+      }
+   }
+}
+
+
 
 static GLboolean run_vertex_stage( GLcontext *ctx,
 				   struct tnl_pipeline_stage *stage )
@@ -129,6 +145,8 @@ static GLboolean run_vertex_stage( GLcontext *ctx,
    if (ctx->VertexProgram._Current) 
       return GL_TRUE;
 
+   tnl_clip_prepare(ctx);
+
    if (ctx->_NeedEyeCoords) {
       /* Separate modelview transformation:
        * Use combined ModelProject to avoid some depth artifacts